(1) Teeth may be a symbol of aggressiveness. If the dream is showing someone bitting someone else, it may mean there is an
aggressive nature towards that person.

(2) False teeth may symbolize insincerity.

(3) Losing teeth may symbolize a feeling of - or fear of - getting older or impotent or losing sexual attractiveness. Or they may represent a retreat to infancy
(when, toothless, you enjoy your mother's breasts and nourishment), and hence a refusal to face reality. Alternatively, they may symbolize the start of a new phase
in your life (knocking a tooth out sometimes featured in male initiation rites in mythology).

(4) A bad tooth may represent a painful or rooten part of one's feelings, life or relationships; angry or regretful words.

(5) "Teeth" in the dream world are most often an archetypal image of the dreamer's sense of confidence and competence in the waking world. Dreaming that there is something amiss with my teeth usually points to insecurities about my ability to "get my teeth into it," or maybe I've "bitten off more than I can chew."
Ironically, the very fact that you remember such a dream is a reliable indicator that the you, the dreamer, can deal creatively and transformatively with the problems that life presents. If this were not the case, you would not even have remembered the dream. All dreams (even nightmares!) come in the service of health and wholeness, and no dream ever came to anyone to say, "Nyah, nyah--you've got these problems and you can't do anything about them!" The more emotionally charged, or urgent the dream, the more likely that it points to a creative possibility previously hidden from the conscious mind, in response to a pressing waking life problem.